The episode introduces Detective Sergeant Janie Mallowan, an ambitious young detective eager to solve big cases, and John Chapel, a retired actor famous for playing TV detective Caesar. Their dynamic is central, with Janie initially reluctant but eventually teaming up with John, who uses his acting insight to help solve the murder case.

The investigation begins with Carwyn Rees, a wealthy property developer, found dead with a gunshot wound initially thought to be suicide. John Chapel suspects murder based on his experience playing a detective, which is later confirmed by the medical examiner. Janie and John then collaborate to uncover the true culprit.

John Chapel, known for his role as Inspector Charles Caesar on TV, acts as an unconventional consultant in the investigation. His knowledge from playing a detective allows him to notice details others miss, such as deducing that Carwyn Rees was murdered, not a suicide.

The episode blends comedy with the whodunit detective genre. It features quirky, sharp-brained lead characters and includes comedic moments, especially in the first ten minutes, while maintaining a crime investigation narrative.

Key plot points include the suspicious death of Carwyn Rees, the victim watching old episodes of the TV show Caesar at the time of his death, and the involvement of various characters such as the victim's wife Danielle and a postman present at the scene. The episode also hints at complexities behind the murder beyond the initial suicide assumption.